A new Physical Review Letter by Prof. Philip Kim and colleagues from Columbia University, Rice University, and National Institute for Material Science, Tsukuba, Japan, reports the enhancement of the thermoelectric power (TEP) in graphene with extremely low disorder. The authors observe that, at high temperature, the TEP is substantially larger than the prediction of the Mott relation, approaching to the hydrodynamic limit due to strong inelastic scattering among the charge carriers. However, closer to room temperature the inelastic carrier–optical-phonon scattering becomes more significant and limits the TEP below the hydrodynamic prediction.